I've had two 69 GPs with the 428HO.
The motor should be a XG with #62 heads. You could get the 428HO with a/c but only with automatic transmission. The 428HO comes with the same long branch exhaust manifolds that came on the 67-69 Firebird HO and D-port ram air cars.
The rear end should be a heavy duty 10 bolt rear. The 12-bolt wasn't offered until 1970 in the 455.
I personally haven't seen a 69 GP with hood tach, but I believe it was offered as an option that year. Both of mine had the tach in-dash.
Mike
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